Authorities have arrested a 16-year-old on suspicion of running over a San Leandro police officer and nearly hitting another officer Thursday morning, prompting the officers to open fire. A 19-year-old man was also arrested in the case.

Safety advocates say at least four people have died from metal shards released when faulty air bags explode, and there have been multiple injuries. They also say more than 20 million vehicles in the U.S. are equipped with the faulty air bags, and the problem is apparently worse in humid areas.